"Index exceeds matrix dimensions" in imwrite()

Hello everyone, I am trying to save my images using imwrite() but its hitting "Index exceeds matrix dimensions." error at line no 134 i.e at " imwrite(final_img, strcat(output_folder, srcFiles(i).name));" I am not getting how to resolve this error. If any of you have an answer to this please tell me. Thank you!!

if true
  clc;
clear all;
srcFiles = dir('C:\Users\Dell\Desktop\Messi_Tiff\abn_1\*.tif'); 
x= length(srcFiles);
for i=1:x
  filename = strcat('C:\Users\Dell\Desktop\Messi_Tiff\abn_1\',srcFiles(i).name);
  I = imread(filename);
  %imshow(I);
  green_cnl = I(:, :, 2);
  K = imadjust(green_cnl,[0.13 0.3],[]);
  %figure, imshow(K);

    img_adap = adapthisteq(K);
    %figure, imshow(img_adap);

    se = strel('disk',15);
    close_img = imclose(img_adap,se);
    %figure, imshow(close_img),title('Closeing');

    img_sub=imsubtract(close_img,img_adap);
    %figure, imshow(img_sub),title('Subtract');

    level=graythresh(img_sub);
    img_BW = im2bw(img_sub,level);
    %figure,imshow(img_BW),title('Binary image using graythresh');

    BW_10_test = bwareaopen(img_BW,150);
    %figure,imshow(BW_10_test),title('without bessels.................');

    [xx,yy]=find(BW_10_test==1);
    nn=[xx,yy];

    img_BW_test=im2bw(img_sub,0.14);
    %figure,imshow(img_BW_test),title('create binary image using 0.15');

    img_BW_filter = medfilt2(img_BW_test);            
    %figure,imshow(img_BW_filter),title('Median Filtering');

    BW_10 = bwareaopen(img_BW_filter,10);
    %figure,imshow(BW2),title('last line');

    BW_100 = bwareaopen(img_BW_filter,100);
    %figure,imshow(BW_100),title('last line2');

    img1_BW=imsubtract(BW_10,BW_100);
    %figure,imshow(img1_BW),title('binary img1 using size 10 to 100');

    for i=1:size(nn)

        pos_x=nn(i,1);
        pos_y=nn(i,2);
        img1_BW(pos_x,pos_y)=0;
    end
    %figure,imshow(img1_BW),title('Binary img1 without vassels pixels');

    img_imadjust_sub = img_sub;
    %figure, imshow(img_imadjust_sub),title('img_imadjust_sub');

    [x1,y1]=find(img_imadjust_sub>=58 & img_imadjust_sub<=155);
    n1=[x1,y1];

    img2=zeros(size(img_adap));

    for i=1:size(n1)

        pos_x=n1(i,1);
        pos_y=n1(i,2);

            img2(pos_x,pos_y)=1;
    %    test3(pos_x,pos_y)=255;

    end

    img2_filter=medfilt2(img2);
    %figure, imshow(img2_filter),title('im2 using color');

    BW2_10 = bwareaopen(img2_filter,10);
    %figure,imshow(BW2),title('last line');

    BW2_100 = bwareaopen(img2_filter,100);
    %figure,imshow(BW2_100),title('last line2');

    img2_BW=imsubtract(BW2_10,BW2_100);
    %figure,imshow(img2_BW),title('img2 with noise');

    for i=1:size(nn)

        pos_x=nn(i,1);
        pos_y=nn(i,2);
        img2_BW(pos_x,pos_y)=0;
    end
    %figure,imshow(img2_BW),title('img2 with out noise');

    final_img=zeros(size(img_adap));

    img_add=imadd(img1_BW,img2_BW,'uint8');

    [x3,y3]=find(img_add==2);
    n3=[x3,y3];

    for i=1:size(n3)

        pos_x=n3(i,1);
        pos_y=n3(i,2);
        final_img(pos_x,pos_y)=1;

    end

    img_mask=imread('D:\mask.tif');
    img_mask=im2bw(img_mask);
        [xmask,ymask]=find(img_mask==0);
        nmask=[xmask,ymask];

    for i=1:size(nmask)

        x=nmask(i,1);
        y=nmask(i,2);
        final_img(x,y)=0;
    end 

      %figure,imshow(final_img),title('MA Detection');

      %final_img = im2uint8(final_img); 
    %filename = [sprintf('%03d',i) '.tif'];
    output_folder = 'D:\abn_1\';
    %fullname = fullfile(output_folder,filename);
    %imwrite(IM2,fullname);
    imwrite(final_img, strcat(output_folder, srcFiles(i).name));

 end

end

Answer 1

[Von Duesenberg]

I just had a quick look but it seems to me that you're using "i" as an index in different (and nested) loops, so the values in nested loops override your the value of i in the main loop.

[pawarcse]

Okay. Should I use different variable names??

Solved the problem. Thank you very much!!

[Von Duesenberg]

Yes, it's good practice to use more explicit names.

[pawarcse]

Yes!!